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Summary: Fields | Ctors | Methods | Inherited Methods

# Observable

`public abstract class Observable`
`extends Object` ``

java.lang.Object
↳ | android.database.Observable<T>

Known direct subclasses ContentObservable, DataSetObservable
ContentObservable | A specialization of `Observable` for `ContentObserver` that provides methods for sending notifications to a list of `ContentObserver` objects.
DataSetObservable | A specialization of `Observable` for `DataSetObserver` that provides methods for sending notifications to a list of `DataSetObserver` objects.

Provides methods for registering or unregistering arbitrary observers in an `ArrayList`. This abstract class is intended to be subclassed and specialized to maintain a registry of observers of specific types and dispatch notifications to them.

## Summary

### Fields
`protected final ArrayList<T>` | `mObservers` The list of observers.

### Public constructors
`Observable()`

### Public methods
`void` | `registerObserver(T observer)` Adds an observer to the list.
`void` | `unregisterAll()` Remove all registered observers.
`void` | `unregisterObserver(T observer)` Removes a previously registered observer.

### Inherited methods
From class `java.lang.Object`
`Object` | `clone()` Creates and returns a copy of this object.
`boolean` | `equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void` | `finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>` | `getClass()` Returns the runtime class of this `Object`.
`int` | `hashCode()` Returns a hash code value for the object.
`final void` | `notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void` | `notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String` | `toString()` Returns a string representation of the object.
`final void` | `wait(long timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void` | `wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void` | `wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

## Fields

### mObservers

    protected final ArrayList<T> mObservers

The list of observers. An observer can be in the list at most once and will never be null.

## Public constructors

### Observable

    public Observable ()

## Public methods

### registerObserver

    public void registerObserver (T observer)

Adds an observer to the list. The observer cannot be null and it must not already be registered.

Parameters
`observer` | `T`: the observer to register

Throws
`IllegalArgumentException` | the observer is null
`IllegalStateException` | the observer is already registered

### unregisterAll

    public void unregisterAll ()

Remove all registered observers.

### unregisterObserver

    public void unregisterObserver (T observer)

Removes a previously registered observer. The observer must not be null and it must already have been registered.

Parameters
`observer` | `T`: the observer to unregister

Throws
`IllegalArgumentException` | the observer is null
`IllegalStateException` | the observer is not yet registered

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